Example unittests?

[rikki cattermole]

This needs to be opt-in by the IDE on each call.

Here is all of the possible documentation sources:

- Recommended symbol
- Prior symbol when recommended symbol is just ``/// Ditto``
- Unittest body
- Unittest comment

Its just too much to go into a recommendation tooltip normally. They 
will have to be modified to accommodate it and even then it'll be to taste.